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There are 9 nine-letter words containing OPTO

APOPTOSESapoptoses n. Plural of apoptosis.
apoptoses v. Third-person singular simple present indicative form of apoptose.
APOPTOSIS n. the natural self-destruction of cells in a growing organism.
APOPTOSISapoptosis n. (Biology, cytology) A process of programmed cell death by which cells undergo an ordered sequence of…
APOPTOSIS n. the natural self-destruction of cells in a growing organism.
APOPTOTICapoptotic adj. (Biochemistry) Of or pertaining to apoptosis.
APOPTOTIC adj. relating to apoptosis, the natural destruction of cells in a growing organism.
MONOPTOTEmonoptote n. (Grammar, obsolete) A noun which only occurs in one case.
MONOPTOTE n. a noun that has one grammatical case only.
OPTOMETERoptometer n. An instrument for measuring the focus of the lens of the eye.
OPTOMETER n. an instrument for testing vision.
OPTOMETRYoptometry n. The art and science of vision and eye care.
OPTOMETRY n. the science of vision and eye-care.
OPTOPHONEoptophone n. A device that transforms light into sound.
optophone n. A device, used by the blind, that scans text and generates a different sound for each character.
OPTOPHONE n. a device transforming light into sound.
PROPTOSESproptoses v. Third-person singular simple present indicative form of proptose.
PROPTOSIS n. the forward displacement of an organ, particularly the eyeball.
PROPTOSISproptosis n. Exophthalmos.
PROPTOSIS n. the forward displacement of an organ, particularly the eyeball.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

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